I couldn't tell you

idiom

Definition of I couldn't tell you

: I don't know "Do you know where the library is?" "I'm sorry. I couldn't tell you."

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“I couldn't tell you.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/I%20couldn't%20tell%20you. Accessed 19 Feb. 2020.

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